The bill, passed last month in the California Senate, allows doctors to prescribe life-ending medication to patients who have only six months or less to live. It's required that patients submit written request for the lethal drugs and two doctors agree to the prescription, Xinhua news agency reported.

The patients must also be mentally capable of making the medical decision and physically capable of taking the drugs on their own.

The new law will become effective in 2016. By then, California will be the fifth American state to allow terminally ill patients to commit doctor-aided suicide, joining Oregon, Washington, Vermont and Montana.

This bill is about life and death, said Brown in a statement explaining his decision, adding that the key part of the issue is whether it should continue to be a crime in California for dying patients to take their won lives.

The campaign for the right-to-die legislature has been going on in California for years with strong opposition from religious and disability rights groups.

The movement gained big momentum last year after the death of 29-year-old Californian resident Brittany Maynard, who suffered end-stage brain cancer and had to move to Oregon to take her own life.

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A bench of Chief Justice Rajendra Menon and Justice V K Rao passed the order while acting on a PIL filed by Delhi-based dermatologist Zaheer Ahmed who complained that lakhs of medicines were being sold on the internet every day without much regulation, posing a huge risk to patients and doctors alike.